CONTRIBUTION TO THE SIGNAL-PROCESSING OF ULTRASONIC PULSES

The paper deals with the signal processing of ultrasonic pulses in abs orptive and dispersive solids. The linear theory based on the Fourier transform is applied to the study of ultrasonic wave propagation in th e polymeric film strip. The spurious echoes stemming from wave reflect ion at the borders of the specimen can destroy part of the pulse. Two methods of analysis of partly destroyed signals are presented and comp ared using mathematical modelling of the ultrasonic pulse propagation in the material.